SN250 datasheet(5/130 Pages) STMICROELECTRONICS

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SN250

General description

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General description

The SN250 is a single-chip solution that integrates a 2.4GHz, IEEE 802.15.4-compliant

transceiver with a 16-bit XAP2b microprocessor. It contains integrated Flash and RAM

memory and peripherals of use to designers of ZigBee-based applications.

The transceiver utilizes an efficient architecture that exceeds the dynamic range

requirements imposed by the IEEE 802.15.4-2003 standard by over 15dB. The integrated

receive channel filtering allows for co-existence with other communication standards in the

2.4GHz spectrum such as IEEE 802.11g and Bluetooth. The integrated regulator, VCO, loop

filter, and power amplifier keep the external component count low. An optional high

performance radio mode (boost mode) is software selectable to boost dynamic range by a

further 3dB.

The XAP2b microprocessor is a power-optimized core integrated in the SN250. It supports

two different modes of operation—System Mode and Application Mode. The ZNet stack

runs in System Mode with full access to all areas of the chip. Application code runs in

Application Mode with limited access to the SN250 resources; this allows for the scheduling

of events by the application developer while preventing modification of restricted areas of

memory and registers. This architecture results in increased stability and reliability of deployed

solutions.

The SN250 has 128KB of embedded Flash memory and 5KB of integrated RAM for data

and program storage. The SN250 software stack employs an effective wear-leveling

algorithm in order to optimize the lifetime of the embedded Flash.

To maintain the strict timing requirements imposed by ZigBee and the IEEE 802.15.4-2003

standard, the SN250 integrates a number of MAC functions into the hardware. The MAC

hardware handles automatic ACK transmission and reception, automatic backoff delay, and

clear channel assessment for transmission, as well as automatic filtering of received

packets. In addition, the SN250 allows for true MAC level debugging by integrating the

Packet Trace Interface.

To support user-defined applications, a number of peripherals such as GPIO, UART, SPI,

I2C, ADC, and general-purpose timers are integrated. Also, an integrated voltage regulator,

power-on-reset circuitry, sleep timer, and low-power sleep modes are available. The deep

sleep mode draws less than 1

μA, allowing products to achieve long battery life.

Finally, the SN250 utilizes the non-intrusive SIF module for powerful software debugging

and programming of the XAP2b microcontroller.

Target applications for the SN250 include:

●

Building automation and control

●

Home automation and control

●

Home entertainment control

●

Asset tracking

The SN250 is purchased with ZNet, a ZigBee-compliant software stack developed by

Ember Corporation, providing a ZigBee profile-ready, platform-compliant solution.This

technical datasheet details the SN250 features available to customers using it with the ZNet

stack.

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